<H2>Can Jetty do Single Sign On Authentication</H2>

By there nature, BASIC and DIGEST authentication support single sign (SSO) on as
the client send the same credentials to all webapplications on the same host
address.
<p>
For FORM authentication, more support is required as the browser/client is
not part of the authentication implementation.  Jetty support SSOs for FORM
authentication by defining a SSORealm interface. UserRealm implementations
that also implement the SSORealm interface are used by the FormAuthenticator
in SSO mode.  
<p>
The HashUserRealm provided with Jetty implements SSORealm by delegating to
a configured SSORealm implementation. The HashSSORealm implementation is
provided to support basic non-distributed SSO functionality.
<p> 
The sample configuration file demoSSO.xml runs the Jetty demo twice
in SSO mode at /jetty0 and /jetty1. Logging into one instance will enable SSO
authentication in the other.
<p>
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